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Department of Estuarine and Ocean Sciences Seminar - Dr. Hilde Oliver

When: Wednesday, October 6, 2021
12:30 PM - 1:30 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
Seminar Announcement

"Subsurface Diatom Hotspots in the Middle-Atlantic Bight Slope Sea Driven by Gulf Stream Meandering"

Dr. Hilde Oliver
Postdoc Scholar
Applied Ocean Physics and Engineering
Woods Hole Oceanographic Institution

Wednesday, October 6, 2021
12:30 pm to 1:30 pm
SMAST East Rooms 101/102
And Via Zoom

Abstract: With decreasing stability of the Gulf Stream (GS), its meanders have interacted with the Mid-Atlantic Bight continental shelf and slope sea region more frequently. The implications of these increased intrusions for regional biological productivity are unknown but have been thought to potentially reduce overall productivity by introducing low-nutrient, oligotrophic Gulf Stream water to the otherwise productive shelf edge region. However, we present evidence of intense subsurface diatom hotspots in the Mid-Atlantic Bight (MAB) slope sea that likely resulted from a GS intrusion in July 2019. The hotspots (at ~50 m) were associated with water mass properties typical of GS water (~100 m); it is likely that the hotspots resulted from the upwelling of Gulf Stream water while being transporting into the slope sea, likely by a Gulf Stream meander directly intruding onto the continental slope east of the observed hotspots. By their subsurface nature, these chlorophyll hotspots were not detected by satellites; understanding how increasingly frequent direct GS intrusions will impact MAB marine ecosystems will therefore require ongoing physical and biogeochemical measurements of the entire water column.
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Contact: > See Description for contact information
Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series